How to Include JARs within JARs in the Java Classpath?

Including JARs within JARs in Java Classpath

Embedding JAR files within other JAR files can enhance modularity and packaging convenience. In Java, you may encounter a scenario where you need to specify a classpath that incorporates a JAR file nestled within another JAR. This article explores the methods for accomplishing this task.

One-Jar

One-Jar is a specialized classloader that facilitates nesting JAR files. By utilizing One-Jar, you can construct a single JAR that houses both your application and its necessary libraries. The classloader seamlessly merges the contents of the nested JARs, enabling their classes to be accessed within the primary JAR's classpath.

UberJar/Shade

UberJar and Shade are tools tailored for Maven environments (1 and 2, respectively). They provide a simplified mechanism for including nested JARs. Upon execution, UberJar/Shade extracts the contents of the referenced JARs and amalgamates them into a single top-level JAR file. This approach eliminates the need for complex classloader configurations.

Maven Assembly Plugin

While One-Jar and UberJar/Shade offer straightforward solutions, Maven users seeking more granular control may leverage the assembly plugin. This plugin offers advanced customization options for creating customized JARs that incorporate additional resources, manifests, or executions during the assembly process. However, using the assembly plugin requires a more in-depth understanding of its functionalities.

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